Knife sharpener



Mar. 27, 1923. 1,449,636

.1. T. TILLMAN r-:T AL.

KNIFE SHARPENER Filed Apr. e, 1921 ramas Mar. a?, ieee.

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saID 'Hunan assioma fro SAID vsafrncm.

'Knien saharienne.

application mea Afprn c,

To all 'whom t may concern i Be it known that we, JOSEPH vT. TniMAN more especially adapted for use in sharpening carving knives, paring knives and the like.

The improved Sharpener is'illustrated inA the accompanying drawings., .wherein like characters indicate like parts throughout the several views.

Referring to the drawings: Fig.A 1 is a side elevation showing the improved sharpener;

Fig. 2 is a plan View thereof; and l Fig. 3ds a'l'section on the line 3--3 of FigQ. 1 v l l.

. .the sharpening.. elements of this device are two intermeshing rollers t having sharp il-.shaped spiral threads 5 held closely in mesh in a suitable holder and capable of intermeshing rotation from time to time as their threads become dnlled in spots. As preferably constructed, these rollersV 4 are formed with projected trunnions 6 that are rotatively and 'removabl seated in 'blique notches or open seats 7 ormed in upturned parallel anges '8 of a fiat bearing bar or plate 9 that is preferably extended to form a suitable handle 10 at one end and, at its other end, is turned up to form an end 1521. serial 'mi' 458,956'.

seats and frictionallylocks the two rollers aga-inst rotation. l A

Between the notchesf? and in line with the intermeshing portionsof the threads of the two rollers, vthev sidev .flanges 8 are notched., orcut away at 13 to'aiiord .clearance for. a

knife blade y (see Eig. 1), that is in positionfto be s arp'ened. The handle l() .'jisv' show-i1'` asv provided.' .with vperforationsy 14, through which screws, not shown, may be passed, to anchor the Sharpener to a table shelf orother suitable support.

The spirally threaded rollers are preferably made from` toolsteel and tempered Very hard,` but, at anyrate, must bemade Very hard or temperedftoahigh degree so that the sharpedges of the threads, without becomingqulckly dulled, -will cut the edge even of a knife that -isv tempered to. a high degree of hardness. w p

The sharpening of the knife may he quickly dulled, vwill cut the edge even of a knife that is tempered tov a high degreev of hardness. v 1

The sharpenin of .the .knife may be quickly produced y placing the edge thereof in contact with the threads of the two rollers-at their inner sections and then drawing the knife edgewise across the threads. In this way, a knife may be very quickly sharpened and the sharpening will be very even, 'because the large number of threads,

t read surfacesmay be brought intol posi,-

' uickly dulled, but, from time to time, new,

tion for action by slight step by steprotations of the rollers; and here it isimportant to note that because'of the threaded engagement which causes the two rollers to ro. A

tate in mesh *withV -a sort of vs iral tion, rotation of the one rol er w11 causea corresponding rotation of the other roller and, hence, thep threads ofthe two rollers in use will be worn out or dnlled simultaneously.

This Sharpener, while of small cost, is of very high efficiency and durable.

-What We claimr is:

A knife Sharpener comprising a holder having laterally spaced side flanges and an end flange, said side flanges having open Y'5.' seats, Sharpening rollers hdving:r intermeshl:ing spiral threads and also having trunnions rotatably mounted 1n said open seats and wronged to be lifted gherefrom', and a screw applied through said end flange and operative on the threads of the adjacent roller to 10 frictionally clamp the two rollers toggfether and hold the same in said open seats.

In testimony whereof ive affix our signatnres.

JOSEPH T. TILLMAN. WILLIAM J. VSETECKA. 

